Aerial photo taken on Jan. 14, 2019 shows the construction site of an Argentina-China joint hydropower megaproject where two hydroelectric dams, Condor Cliff and La Barrancosa, are being erected along the Santa Cruz River in southern Argentina to boost national energy output. Argentina's President Mauricio Macri on Monday said the project is "highly important" and "emblematic" in terms of renewable energy and economic development. (Xinhua/Ni Ruijie)